TexAQS 2006 TOPAZ Lidar data

August 5 - Final Data

This flight was designed to investigate potential stagnation of ship channel emissions
over Galveston Bay and recirculation back over Houston, which frequently produces high
ozone concentrations at the surface. The flight time was moved up to mid morning in an
attempt to avoid cloudiness that was anticipated to increase during the day. After takeoff
a line of convection was observed to the west of Galveston Bay, indicating some convergence
probably associated with the Bay breeze front. The first north-south leg east of Galveston
Bay showed the background level ozone concentrations. Some elevated ozone levels were observed
in the region of the ship channel. Increasing clouds during the mission hampered ozone
sampling west of Houston and over downtown. Although three circuits of the bow tie pattern
over Houston were planned, the mission was broken off early after two circuits due to the
cloud cover. Landing was at 14:06 CDT. The Twin Otter overflew the Ron Brown near Barbours
Cut at 11:59 and 13:01 CDT.